How does carbon chain length affect energy density?

How does carbon chain length affect energy density?

By investigating the energy produced during the combustion of different fuels, a linear increasing relationship (Figure 3) was discovered that the longer the carbon chain lengths (larger molar mass) in each fuel molecule, the higher energy released during combustion.

Do longer carbon chains release more energy?

Actually, the shorter the chain, the more energy per gram. Hydrogen has more energy per gram than alkanes (but is harder to store). It is not true that longer chain hydrocarbons or carbohydrates contain more energy.

How does carbon chain length affect combustion?

The burning rate increase with the shorter carbon chain length due to the greater oxygen content in the molecule and the lower of boiling point temperature and latent heat of evaporation.

Why does heat of combustion increase with chain length?

HYPOTHESIS If the number of carbon atoms in an alkanol is increased, then the alkanol containing the longest carbon chain will have a higher heat of combustion, because as there are more carbon atoms, more energy will be released as a result of the breaking of the covalent bonding and the forming of bonding as the …

Are longer carbon chains stronger?

as a matter of principle the acidity of a carboxylic acid will decrease with increasing length of alkyl chain. The reason is the positive inductive effect of any alkyl group which is the stronger the longer the alkyl group is (if it is nonbranched).

Why do larger molecules release more energy?

The more hydrogen per carbon, the lower the oxidation state and the more energy that will be released during the oxidation reaction. Thus the greater the H/C ratio, the more energy release on combustion.

Which fuel releases the most energy per gram?

Methane releases the most amount of energy per gram of fuel.

What effect does the length of the carbon chain have on the enthalpy of combustion in primary alcohols?

The lengths are measured by a ruler. Hypothesis: The higher the number of carbon is in the hydrocarbon chain, the greater the enthalpy change of combustion of the primary alcohol.

Which would have the highest energy released during combustion?

Hydrogen has the highest specific energy of any fuel at 120.6 MJ kg−1 (33.5 kW h kg−1) and the highest specific combustion energy release of any commonly occurring material.

Why does more carbon atoms mean more energy released?

Fossil fuels are composed primarily of hydrocarbons (molecules containing primarily carbon hydrogen bonds). The more hydrogen per carbon, the lower the oxidation state and the more energy that will be released during the oxidation reaction. Thus the greater the H/C ratio, the more energy release on combustion.

Why are longer carbon chains stronger?

Summary: the slight difference in acidity between both carboxylic acids is due to the inductive effect of the alkyl group which donates electrons. The reason is the positive inductive effect of any alkyl group which is the stronger the longer the alkyl group is (if it is nonbranched).

Do longer carbon chains have higher boiling points?

As the chain length (numbers of carbons) increases the melting and boiling points of the alkanes gradually increase for these compounds. The reason that longer chain molecules have higher boiling points is that longer chain molecules become wrapped around and enmeshed in each other much like the strands of spaghetti.

Do fuels with longer or shorter chains have more energy per gram?

However, that does not mean that fuels with longer chains have more energy per gram than fuels with shorter chains. Actually, the shorter the chain, the more energy per gram. Hydrogen has more energy per gram than alkanes (but is harder to store).

Why are longer chain hydrocarbons more energy efficient?

Longer chain hydrocarbons represent more convenient fuels because they are liquids (they are more dense, more fuel molecules per unit volume). They also provide the opportunity to “control” the burning process. Similarly, why does more carbon atoms mean more energy released?

Why does hydrogen have more energy per gram than alkanes?

Hydrogen has more energy per gram than alkanes (but is harder to store). As the chain length increases, the number of C-C bonds increases in proportion to the number of C-H bonds.

Why do fats contain more energy than carbohydrates?

Fats contain more energy than carbohydrates because they need more oxygen for each carbon atom, which in turn produces more energy. This arises because there are more electrons surrounding each carbon atom in fat.